sah -- he (Narada); aha -- said; devam -- the lord; girisam -- Siva; upadhava -- you should worship; asu -- quickly; siddhyasi -- you will become successful; yah -- who; alpabhyam -- slight; guna -- by good qualities; doshabhyam -- and faults; asu -- quickly; tushyati -- is satisfied; kupyati -- is angered.

Narada told him: Worship Lord Siva and you will soon achieve success. He quickly becomes pleased by seeing his worshiper's slightest good qualities -- and quickly angered by seeing his slightest fault.